4.06 patch notes up

[Shurrikhan]

They share the same traits as well. SE is planning on ridding classes soon. SMNs getting an overhaul.

They share six traits. The remaining five to six are not shared.

I was mistaken previously; they actually don't even share all traits prior to level 30. Enhanced Mind is given to Scholars at level 20. It is NOT shared with Summoner. Thus a job could alter the effects of even a level 1 ability for its job with no impact on other jobs stemming from the same class, even when either job is synced below the point of acquiring the job (i.e. below level 30).

tl;dr: There is absolutely no remaining restriction to their ability to balance all Arcanist skills separately for Scholar and Summoner.